Small Block Chevy 327-350-383 Harmonic Balancer 6.75'' Internal Balance 
This damper is 6-3/4" in diameter and approximately 1-1/8" thick. This is one of the most popular damper for internally balanced small block Chevy's. This damper is dimensionally identical to the stock G.M. 6-3/4" damper. They have 60° of easy to read timing marks and engraved marks every 90 degrees. This high performance street model weighs approximately 8-1/2 pounds